You may laugh now but we ( Macedonian- Turkish & -Greek Gipsys ) use hearing Aid´s or Hear devices.

Here you can see what I meen:
http://www.oticon.dk/eprOtiScripts/Files/encyclopedia/images/Body_worn_hearing_aid.jpg

So we prepare this round thing ( Mic ) on the Barrel by using a special selfmade made Screw with an whole which goes throug this screw. Also I´m preparing this screw with an snapring so that this Mic is fitting perfect.
It´s really hard to explain that to you via e-mail and my english is really not the best.
So I´m really sorry if I cannot explain this to you as you may wish.

The cable that you see is a two pin cable. We cut it in a size we need it and soldering it on a normal Banana Cable. no you can plug you clarinet into a wireless system or directly into the Mixer or whatever.

That´s the way we play on Weddings and the sound is still perfect.
Nobody will get the exact same sound as when you play unplugged but it´s really really close to it and mouch better then a Barcus Berry Mic.

Whe you´re thinking about to buy one of this Hearing aid be shure that you ask for a wide spectrum Mic / Aid. They have the best sound.

You have also a lot of brands of these king of hering aids. buy Philips or Oticon Aids with two pins.